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stm32: Add architecture adjtime() support

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Based on the samv7 implementation, adjusts systick period.
This commit is contained in:
Petteri Aimonen 2023-09-28 10:51:04 +03:00 committed by Xiang Xiao
parent cb11747f36
commit 76f6d340ee
2 changed files with 70 additions and 3 deletions
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1
arch/arm/Kconfig
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@ -429,6 +429,7 @@ config ARCH_CHIP_STM32
select ARCH_HAVE_TIMEKEEPING
select ARM_HAVE_MPU_UNIFIED
select ARMV7M_HAVE_STACKCHECK
select ARCH_HAVE_ADJTIME
---help---
STMicro STM32 architectures (ARM Cortex-M3/4).

72
arch/arm/src/stm32/stm32_timerisr.c
View File

@ -58,16 +58,19 @@
/* And I don't know now to re-configure it yet */
#ifdef CONFIG_STM32_SYSTICK_HCLKd8
# define SYSTICK_RELOAD ((STM32_HCLK_FREQUENCY / 8 / CLK_TCK) - 1)
# define SYSTICK_CLOCK (STM32_HCLK_FREQUENCY / 8)
#else
# define SYSTICK_RELOAD ((STM32_HCLK_FREQUENCY / CLK_TCK) - 1)
# define SYSTICK_CLOCK (STM32_HCLK_FREQUENCY)
#endif
#define SYSTICK_RELOAD ((SYSTICK_CLOCK / CLK_TCK) - 1)
/* The size of the reload field is 24 bits. Verify that the reload value
* will fit in the reload register.
*/
#if SYSTICK_RELOAD > 0x00ffffff
#define SYSTICK_MAX 0x00ffffff
#if SYSTICK_RELOAD > SYSTICK_MAX
# error SYSTICK_RELOAD exceeds the range of the RELOAD register
#endif
@ -98,6 +101,69 @@ static int stm32_timerisr(int irq, uint32_t *regs, void *arg)
* Public Functions
****************************************************************************/
#ifdef CONFIG_CLOCK_ADJTIME
/****************************************************************************
* Function: up_adj_timer_period
*
* Description:
* Adjusts timer period. This call is used when adjusting timer period as
* defined in adjtime() function.
*
* Input Parameters:
* period_inc_usec - period adjustment in usec (reset to default value
* if 0)
*
****************************************************************************/
void up_adj_timer_period(long long period_inc_usec)
{
uint32_t period;
long long period_inc;
if (period_inc_usec == 0)
{
period_inc = 0;
}
else
{
period_inc = (SYSTICK_CLOCK / 1000000) * period_inc_usec - 1;
}
period = SYSTICK_RELOAD + period_inc;
/* Check whether period is at maximum value. */
if (period > SYSTICK_MAX)
{
period = SYSTICK_MAX;
}
putreg32(period, NVIC_SYSTICK_RELOAD);
}
/****************************************************************************
* Function: up_get_timer_period
*
* Description:
* This function returns the timer period in usec.
*
* Input Parameters:
* period_usec - returned timer period in usec
*
****************************************************************************/
void up_get_timer_period(long long *period_usec)
{
uint32_t period;
period = getreg32(NVIC_SYSTICK_RELOAD);
*period_usec = ((period + 1) / (SYSTICK_CLOCK / 1000000));
}
#endif
/****************************************************************************
* Function: up_timer_initialize
*